The sensitive frequency demodulator (LM565 and LM111) circuit

Published:2011/6/16 21:21:00 Author:qqtang | Keyword: sensitive frequency demodulator | From:SeekIC

This circuit consists of the phase-lock integrated circuit LM565, which can track the frequency shift in a wide frequency range. However, to the low frequency signal, as the demodulating output signal is weak, the drifting of the voltage control oscillator will cause the drifting of the comparator working point and then cause faults. To overcome the above weakness, we add a DC recover part in the circuit, so it can work stably even when the frequency of the signal is weak. In the figure, the demodulating circuit composed of LM565 and comparator LM111 is almost the same with ordinary frequency demodulator circuits.



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